package Example01;
import java.sql.*;
public class Example01 {
    public static void main(String[] args) throws SQLException {
        Statement stmt=null;
        ResultSet rs=null;
        Connection conn=null;
        try {
            //1.注册数据库的驱动
            Class.forName("com.mysql.jdbc.Driver");
            //2.通过DriverManager获取数据库连接
            String url=
                    "jdbc:mysql://localhost:3306/jdbc?serverTimezone=GMT%2B8&useSSL=false";
            String username="root";
            String password="123456";
            conn=DriverManager.getConnection(url,username,password);
            //3.通过Connection对象获取Statement对象
            stmt=conn.createStatement();
            //4.使用Statement执行SQL语句
            String sql="select * from users";
            rs=stmt.executeQuery(sql);
            //5.操作ResultSet结果集
            System.out.println("id|name|password"+"|email|birthday");
            while (rs.next()){
                int id= rs.getInt("id");//通过列名获取指定字段的值
                String name=rs.getNString("name");
                String psw=rs.getNString("password");
                String email= rs.getNString("email");
                Date birthday=rs.getDate("birthday");
                System.out.println(id+"|"+name+"|"+psw+"|"+email+"|"+birthday);
            }
        }catch (ClassNotFoundException e){
            e.printStackTrace();
        }finally {
            //6.回收数据库资源
            if (rs!=null){
                try {
                    rs.close();
                }catch (SQLException e){
                    e.printStackTrace();
                }
                rs=null;
            }
            if (stmt!=null){
                try {
                    stmt.close();
                }catch (SQLException e){
                    e.printStackTrace();
                }
                stmt=null;
            }
            if (conn!=null){
                try {
                    conn.close();
                }catch (SQLException e){
                    e.printStackTrace();
                }
                conn=null;
            }
        }
    }
}
